To reach Denver’s city center from Denver International Airport (DEN), the most efficient method is the University of Colorado A Line commuter rail. This train departs every 15 minutes during peak hours, costs $10.50 for a day pass, and arrives at Denver Union Station in exactly 37 minutes.
Denver International Airport (DEN) is situated approximately 25 miles northeast of downtown, making the transition from the terminal to the city center a critical leg of any trip to the Mile High City. In 2026, the infrastructure connecting the airport to Union Station—the city’s central transit hub—is more robust than ever. Whether you are a business traveler heading to a meeting in the Central Business District or a tourist exploring the Lower Downtown (LoDo) district, understanding the nuances of Denver’s transit system ensures a seamless arrival.
The University of Colorado A Line: The Primary Transit Solution
The A Line commuter rail remains the "gold standard" for reaching the city center. Operated by the Regional Transportation District (RTD), this line was designed specifically to bridge the gap between the isolated airport and the urban core. Unlike light rail systems in other cities, the A Line uses heavy commuter rail cars, which offer more significant luggage storage and higher speeds, reaching up to 79 miles per hour.
Finding the Train Station at DEN
Navigating Denver International Airport can be daunting due to its size. The airport is divided into the Jeppesen Terminal and three concourses (A, B, and C). To reach the A Line, you must first head to the Jeppesen Terminal. If you arrive at Concourse B or C, you will take the automated underground train to the terminal.
Once in the Jeppesen Terminal, follow signs for Ground Transportation and the Westin Hotel. The DEN Transit Center is located directly underneath the Westin Denver International Airport Hotel. You will descend the long escalators located at the south end of the terminal (near the large glass windows overlooking the airfield). At the bottom of these escalators, you will find the train platform, ticket vending machines, and RTD information desks.
2026 Pricing and Ticketing Procedures
As of 2026, the RTD fare structure has been simplified to provide better value for airport travelers. A one-way trip from the airport to Union Station falls under the "Airport Fare" category.
- Standard Fare: The cost is $10.50.
- Validity: This $10.50 ticket is actually a Regional Day Pass. This means your ticket is valid for unlimited rides on the entire RTD system (including all buses and other light rail lines) until 2:59 AM the following day.
- Where to Buy:
- Ticket Vending Machines (TVMs): Located on the platform at the airport. These accept cash and credit/debit cards.
- RTD MyRide App: The most convenient method is downloading the RTD MyRide mobile app. You can purchase your ticket on your phone and simply scan the barcode at the validator before boarding.
- Contactless Payment: You can also "tap" your credit card or mobile wallet on the validators located on the platform. The system will automatically calculate the correct fare and apply "fare capping," ensuring you never pay more than the daily limit.
Journey Details and Frequency
The A Line is known for its punctuality and frequent service. During peak hours (typically 5:00 AM to 8:00 PM), trains depart every 15 minutes. During off-peak early morning or late night hours, frequency drops to every 30 minutes.
The trip takes approximately 37 minutes from the airport to Union Station. Along the way, the train makes six intermediate stops:
- 61st & Peña
- 40th & Airport / Gateway Park
- Peoria
- Central Park
- 40th & Colorado
- 38th & Blake
While most travelers stay on until the final stop at Union Station, the 38th & Blake stop is increasingly popular for those staying in the River North Art District (RiNo).
Rideshare and Taxi Options: When to Skip the Train
While the train is the fastest and cheapest option for most, there are scenarios where a rideshare (Uber/Lyft) or a taxi might be preferable, particularly if you are traveling with a large group or have excessive luggage that is difficult to manage on public transit.
Pickup Locations at DEN
Rideshare and taxi pickups are strictly regulated at DEN to manage traffic flow.
- Rideshare (Uber/Lyft): Follow signs to Level 5 (Baggage Claim) and exit through doors 504-512 (Terminal East) or 505-513 (Terminal West). Proceed to Island 5, where passengers meet their drivers.
- Taxis: Taxis are also located on Level 5, Island 1. Cabs are usually lined up and ready for immediate departure.
Cost and Time Comparison
The drive to downtown Denver can take anywhere from 35 to 70 minutes depending on traffic. Denver’s main artery, I-70, and the airport access road, Peña Boulevard, are prone to heavy congestion during morning and evening rush hours.
| Feature | RTD A Line Train | Rideshare (Uber/Lyft) | Traditional Taxi |
|---|---|---|---|
| Cost (Estimated) | $10.50 per person | $55.00 – $85.00+ | $70.00 – $90.00 |
| Travel Time | 37 Minutes (Fixed) | 35–60 Minutes | 35–60 Minutes |
| Frequency | Every 15–30 mins | On-demand | On-demand |
| Luggage Space | Moderate (Racks available) | High (Trunk space) | High (Trunk space) |
| Drop-off Point | Union Station (Central) | Door-to-door | Door-to-door |
Note: Pricing for rideshares can surge significantly during snowstorms or major events at Coors Field or Ball Arena.
Arriving at Denver Union Station
Union Station is the crown jewel of Denver’s transit infrastructure. When the A Line arrives, it pulls into the outdoor commuter rail platforms located at the west end of the station.
Navigating the Station
Upon exiting the train, you will walk toward the historic Beaux-Arts station building. Union Station is more than just a transit stop; it is a "living room" for the city, containing the Crawford Hotel, high-end restaurants, and local boutiques.
- The Great Hall: This is the main interior area. If you need a map, a snack, or a place to sit while waiting for a hotel shuttle, this is the spot.
- The Underground Bus Concourse: If your final destination requires a local bus, you will need to head downstairs to the 22-gate underground bus terminal. This facility is climate-controlled and connects to regional routes across the metro area.
- Light Rail Connections: The E and W light rail lines stop at a different set of platforms located near the Chestnut Pavilion (behind the station). Follow the signs for "Light Rail" to transfer.
Connecting to the City Center
Once at Union Station, you are in the heart of the LoDo district. Many hotels are within walking distance. However, if your destination is further into the city center (near the Colorado Convention Center or the State Capitol), you have two primary options:
- The Free MallRide: This is a zero-fare shuttle that runs up and down the 16th Street Mall. As of 2026, the multi-year renovation of the 16th Street Mall is complete, and the shuttle provides a fast, frequent link between Union Station and the Civic Center area.
- The Free MetroRide: During weekday rush hours, this sister shuttle provides a similar service along 18th and 19th Streets, helping commuters reach the business towers in the Upper Downtown area.
Critical Considerations for 2026 Travelers
Traveling in 2026 involves navigating a modern but busy transit landscape. To ensure a smooth trip, keep the following "pro tips" in mind.
Baggage Handling and Security
The A Line trains are equipped with overhead racks and large bins near the doors for suitcases. However, during peak commute hours (7:00 AM – 9:00 AM), the trains can become crowded with local workers. If you have more than two large bags per person, a rideshare may save you significant stress.
Security personnel and "Transit Ambassadors" are frequently present on the A Line and at Union Station. While the route is generally safe, always keep your belongings within sight, especially during the 37-minute transit where the train makes multiple stops.
Late Night and Early Morning Arrivals
The A Line does not operate 24 hours a day. Generally, the first train departs Union Station for the airport around 3:00 AM, and the last train departs the airport for Union Station shortly after 1:00 AM.
If your flight is delayed and you land at 1:30 AM, you will likely need to use a taxi or rideshare. There are no late-night "owl" buses that currently replicate the A Line's route to the city center.
Weather Impacts
Denver is known for rapid weather changes. While the A Line is incredibly resilient to snow, extreme blizzards can occasionally cause delays or temporary suspensions. Fortunately, the tracks are equipped with heaters to prevent freezing. If the train is down, Peña Boulevard is likely also a mess, so checking the RTD Service Alerts before leaving the terminal is essential during winter months.
Alternative Private Shuttles
While the A Line has largely replaced the need for airport shuttles to the city center, some private companies still operate specialized services.
- Mountain Shuttles: If your goal is not actually the Denver city center but rather the ski resorts (Vail, Breckenridge, etc.), you should not take the train to Union Station. Instead, book a shuttle like Epic Mountain Express or Peak 1 Express directly from the airport terminal.
- Hotel Shuttles: A few hotels near the airport (the "Airport Corridor") offer free shuttles. However, almost no downtown hotels offer free airport pickups due to the distance. You will be expected to use the A Line or a private car.
Frequently Asked Questions
Is the A Line train safe to ride with luggage?
Yes, the A Line was designed as an airport rail link. Each car features dedicated luggage racks and level boarding, meaning you don't have to lift bags up steps to enter the train. Security officers frequently patrol the line, and the passenger demographic is a mix of travelers and professional commuters.
Can I use the same ticket for the bus once I reach Union Station?
Absolutely. The $10.50 Airport Fare is valid as a Regional Day Pass. You can transfer to any RTD local bus, regional bus, or light rail line for the remainder of the service day without paying an additional fee. Just keep your paper ticket or keep your mobile ticket active on the app.
How much time should I allow to get from Union Station back to the airport?
While the train ride is 37 minutes, you should account for the walk to the platform and the 15-minute intervals between trains. A safe window is to arrive at Union Station at least 60 minutes before you need to be at the airport terminal. Combined with TSA security lines, departing downtown 3 hours before your flight is the standard recommendation for 2026.
Is there Wi-Fi on the A Line train?
While there is no dedicated Wi-Fi provided by RTD on the A Line, the entire route has excellent 5G cellular coverage. Most travelers find they can maintain a stable connection for work or streaming throughout the 37-minute journey.
What if I forget to validate my ticket?
If you are using a paper ticket, you must "dip" or scan it at the red validators on the platform before boarding. If you have a mobile ticket, it must be activated in the app. RTD fare inspectors frequently check tickets on the train. Failure to produce a validated ticket can result in a fine exceeding $100.
Next Steps for Your Arrival
Upon landing at Denver International Airport, your first priority should be determining your transit mode based on your party size and luggage. For 90% of travelers, the University of Colorado A Line is the recommended choice.
- Follow signs to the South Terminal/Transit Center.
- Purchase your $10.50 Regional Day Pass via the RTD MyRide app or at a kiosk.
- Board the train and enjoy the 37-minute ride to Union Station.
- Once at Union Station, utilize the Free MallRide or a local ride-hail service to reach your final hotel destination.
By choosing the rail system, you avoid the unpredictability of I-70 traffic and arrive in the heart of Denver ready to explore.
